If you keep getting bubbles, I would suspect the master is not good. Air must be getting around the seals. That is not the first time I came accross that issue.

Got to be.

I just called Napa. They will get a new one for me from the warehouse by tomorrow morning. I could have gotten a new Fenco today from Autozone but I was unsure about that brand.
Napa usually is pretty quality conscious so I hope this is the right decision.

Looks like I'll just take the loss on the one from RockAuto. I don't think it's worth the shipping back to try and get a refund. It was $20.79 plus $4.00 shipping.

If I had left the original one on, I guess I wouldn't be dealing with this. It was working fine. I just thought it would be good to replace it since it was 30 years old.